14C-picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid) absorption and translocation in leafy spurge (Euphorbia esula L.) was evaluated over 2 growing seasons and was compared to selected environmental parameters and root carbohydrate content. 14C-picloram absorption was greatest during the vegetative growth stage (52%) and increased directly with relative humidity but was not affected by the temperature at treatment. 14C-picloram translocation to leafy spurge roots generally was influenced more by the plant growth stage than the environment. The greatest translocation to roots occurred during the true-flower and seed-set growth stages. The water-soluble (monosaccharide and disaccharide) and water insoluble carbohydrate content in leafy spurge roots average across the growing season varied by depth with the lowest amount in the 0- to 8-cm depth, 35 and 53 mg/g, and the most in the 16- to 24-cm depth 84 and 221 mg/g, respectively. 14C-picloram translocation to leafy spurge roots was independent of either carbohydrate fraction when evaluated over the entire growing season. However, 14C-picloram content increased when the water-soluble fraction increased during the true-flower growth stage. 14C-picloram translocation to the roots did not increase in the fall, in contrast to the general hypothesis that herbicides move with photosynthates to the roots. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.